HOW: Begin with your hands and knees on the ground under your hips and your forearms on the ground with your elbows under your shoulders. From this position, kick one leg straight back from your hip until your knee is straight. Bring it back to the starting position and repeat.
FEEL: You should feel you glute muscles working. You should also feel your core working.
COMPENSATION: Don’t twist your back as you kick your leg out. Keep your leg straight out from your hip, not above it.